GCSE Chemistry - Condensation Polymers (Polyesters) #60

This video covers:
- What condensation polymers are
- How they're made from dicarboxylic acids and diols
- How the monomers join together (ester bonds)
- How to write the equations
- Why condensation polymers are more biodegradable than addition polymers
Exam board specific info:
AQA - Separate/triple science and higher tier only
IGCSE Edexcel - Separate/triple science and higher tier only
Edexcel - Separate/triple science and higher tier only
OCR 21st Century - Separate/triple science and higher tier only
OCR Gateway - Separate/triple science and higher tier only
Maths Playlist:
• GCSE Maths (9-1)
GCSE Chemistry playlist:
• GCSE Chemistry - Atoms...
GCSE Biology Playlist:
• Video
GCSE Physics Playlist:
• Video

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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I believe there is an error on the condensation polymer at around 3 minutes there is a missing oxygen bond on the c in the final polymer

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Ah thank you so much Bilal, we wish you all the success 👍

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what a fantastic illustration of the polymerization process! much appreciated for the insights.

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Can u pls tell me whether all condensation polymers are copolymer??

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why does the acid not the alcohol give out the hydrogen

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I didn't two water molecules removal step

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I'm so curious why 2H₂O Molecules are produced per repeating unit...?

[@nic0264]

because theres a double condensation meaning 2 water molecules are produced, the first one when the first pair of OH (from the dicarboxylic acid) and H (from the diol) leave their structures and the second when the same thing happens with the pairs of the other end of each structure

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Have you done the video of additional polymers?

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We have! It should come up if you search ‘addition polymers cognito’

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why does the acid give up its hydroxide ion instead of the alcohol even though both of them have hydroxide ions?

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Because ethanol will change if it gives up its OH

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the product is a polyester

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Hey, thanks for the great explanation. Though I don't understand why those 2 prerequisites you mentioned are required for a polycondensation reaction, and I can't even find any info on that elsewhere.

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[@varishpersaud5093]

Nice video but why is another water molecule lost when drawing the repeating unit? Is one water molecule lost when the two monomers combine, then another when another ester joins?

[@Cognitoedu]

Hi, so tor from the repeating unit, one H2O is lost from the ester bond in the middle, but then another H2O is effectively lost from the 2 ends, in preparation for the formation of new ester bonds at either end. It's a bit weird because it's not really an equation for a single reaction, but a summary of all the condensation reactions. Hope that helps :)

[@varishpersaud5093]

@@Cognitoedu Oh that makes sense now, as the H from the diol and the OH from the carboxyl make up a second water molecule. Thank you!

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Exactly!

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Polyester are biodegradable? Some studies show that they are not. (Could you clear that for me)

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